Trallong (Welsh: Y Trallwng) is a village and community in Powys, Wales, in the historic county of Brecknockshire.

For elections to Powys County Council, Trallong is part of the Yscir electoral ward.

He became a lawyer then a Benedictine monk and served as a missionary in England during the period of recusancy.

The former Salem Calvinistic Methodist Chapel was built in 1831 on the road leading west to Trallong Common.

[3] The overbridge on the approach road to Abercamlais remains as of 2017 as do the large masonry abutments each side of the River Usk where the railway crossed it just south of Trallong Common.